The family of Ln2Ti2S2O5 compounds (Ln = Nd, Sm, Gd,Tb, Dy, Ho, Er, and Y):: Optical properties

被引：0
|
作者：
Boyer-Candalen, C
Derouet, J
Porcher, P
Moëlo, Y
Meerschaut, A
机构：
[1] Univ Nantes, UMR 6502 CNRS, Chim Solide Lab, Inst Mat Jean Rouxel, F-43322 Nantes, France
[2] Ecole Natl Super Chim Paris, UMR 7574 CNRS, Chim Solide Lab, F-75231 Paris, France
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2002年 / 165卷 / 02期
关键词：
rare earths; oxysulfides; diffuse reflectance; crystal field energy levels and parameters; paramagnetic susceptibility;
D O I：
10.1006/jssc.2002.9492
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The optical properties of Ln(2)Ti(2)S(2)O(5), compounds (Ln = Nd, Sm, Gd, Tb, Dy, Ho, Er, and Y) have been measured. Diffuse reflectance spectra revealed a strong absorption band above 2eV, which explains the color of the compounds. Moreover, other bands, with a lower intensity, have been attributed to 4f-4f rare earth transitions. In the case of neodymium the derived energy level scheme is rich enough to determinate a set of phenomenological crystal field parameters that correctly reproduce the spectrum. These parameters were also calculated from the crystallographic structure, in a good agreement with the experiment. Finally, the paramagnetic susceptibility, well reproduced by the calculation, confirms that the rare earth is in a trivalent state. (C) 2002 Elsevier Science (USA).
引用
收藏
页码：228 / 237
页数：10
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